Oil additives, compositions and polymers for use therein
AssigneeExxon Chemical Patents Inc.
InventorsBrian William Davies, Ramah Jessica Brod, Jan Bock, Tuncel Ibrahim
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Abstract
Compositions comprising an ethylene/vinyl acetate or propionate/vinyl linear carboxylate terpolymer improve the low temperature properties of oils having wax contents of at least 3% wt.
Claims14
A fuel oil composition comprising a fuel oil having a wax content of 3.3 to 6% by weight at 10.degree. C. below its cloud point, and 0.025 to 0.2% by weight, based on the weight of fuel oil, of a flow improver composition comprising an oil-soluble ethylene terpolymer having, in addition to units derived from ethylene, units of the formula:
- ##STR6## and units of the formula ##STR7## wherein R.sup.1 and R.sup.2, which may be the same or different, each represent H or methyl, R.sup.3 represents an alkyl group having up to 4 carbon atoms, and R.sup.4 represents n-heptyl;
- the degree of branching of the terpolymer, as measured by proton NMR spectroscopy being less than 6 CH.sub.3 groups per 100 CH.sub.2 units.
A method of improving the low temperature flow properties of a fuel oil having a wax content of from 3.3 to 6% by weight at 10.degree. C. below its cloud point, the method comprising adding to said fuel oil 0.025 to 0.2% by weight, based on the weight of fuel oil, of an oil-soluble ethylene terpolymer having, in addition to units derived from ethylene, units of the formula:
- ##STR8## and units of the formula ##STR9## wherein R.sup.1 and R.sup.2, which may be the same or different, each represent H or methyl, R.sup.3 represents an alkyl group having up to 4 carbon atoms, and R.sup.4 represents n-heptyl;
- the degree of branching of the terpolymer, as measured by proton NMR spectroscopy being less than 6 CH.sub.3 groups per 100 CH.sub.2 units.
Dependencies are inferred from the claim text.